[USRP-users] support for synchronizing two USRPs

Neel Pandeya neel.pandeya at ettus.com
Thu Jul 16 06:21:23 EDT 2020

You cannot synchronize USRP devices by using a daisy-chain configuration.
The 10 MHz reference and the 1 PPS on both USRP devices must be connected
to a common 10 MHz reference and to a common 1 PPS signal.  The OctoClock-G
device can be used to generate these signals and to distribute them to 8
devices.  Then, for each USRP device, in UHD or GNU Radio, set your
clocking source and timing source to "external".



--Neel Pandeya

On Thu, 16 Jul 2020 at 05:00, Snehasish Kar via USRP-users <
usrp-users at lists.ettus.com> wrote:

> Hello
> I am trying to time synchronize two USRPs. I have connected reference and
> PPS trigger out of USRP A to reference and PPS trigger in of USRP B. In
> USRP A i have set time and clock source to GPSDO and in USRP B I have set
> time and clock source to external. But I when I try to compare
> uhd::time_spec for both the boards I see there is a time mismatch. Please
> help me understanding where I am going wrong.
> Regards
> Snehasish
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> USRP-users at lists.ettus.com
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